"The asteroid that unexpectedly exploded over Chelyabinsk in Russia, causing damage but no deaths in 2013, was roughly 20m across – 2024 YR4 is bigger than that but still vastly smaller than the 10km-diameter object that caused the extinction of the dinosaurs."
https://www.theguardian.com/commentisfree/2025/feb/20/asteroid-2024-yr4-earth-scientists-dangers-space